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Earnings (loss) per share (Details) - EUR (€) € / shares in Units, € in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings (loss) per share
Weighted average number of shares used for basic earnings (loss) per share	3,483,633,816	3,565,973,883	3,572,549,651
Potential shares to be issued for ILT incentive plan	6,319,989	7,598,593
Weighted average number of shares used for diluted earnings (loss) per share	3,489,953,805	3,573,572,476	3,572,549,651
Profit (loss) attributable to Eni	€ 13,887	€ 5,821	€ (8,635)
Remuneration of subordinated perpetual bonds net of tax effect	(109)	(95)
Eni's net profit (loss) for basic and diluted earnings (loss) per share	€ 13,778	€ 5,726	€ (8,635)
Basic earnings (loss) per share	€ 3.96	€ 1.61	€ (2.42)
Diluted earnings (loss) per share	€ 3.95	€ 1.6	€ (2.42)

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- Definition

The adjustment to reconcile profit (loss) attributable to the parent entity to the numerator used in calculating earnings (loss) per share, resulting from remuneration on subordinated perpetual bonds, net of tax.

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The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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